Fabrication and soft-magnetic properties of Fe–B–Nb–Y glassy powder compacts by spark plasma sintering technique

Glassy Fe77Ga3P9.5C4B4Si2.5 alloy powders were synthesized in the particle size range below 125 µm by Ar gas atomization. A glassy alloy disc of 10 mm in diameter and 3 mm in thickness with a high relative density of 99.7 % was synthesized by spark plasma sintering. The resulting glassy magnetic core exhibits good soft magnetic properties, i.e., 1.35 T for saturation magnetization, 5 A/m for coercive force and 9600 for maximum permeability.

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Fabrication of large-size Fe-based glassy cores with good soft magnetic properties by spark plasma sintering

Journal of Materials Research ◽

10.1557/jmr.2003.0297 ◽

2003 ◽

Vol 18 (9) ◽

pp. 2115-2121 ◽

Cited By ~ 32

Author(s):

Baolong Shen ◽

Akihisa Inoue

Keyword(s):

Magnetic Properties ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Liquid Region ◽

Soft Magnetic Properties ◽

Soft Magnetic ◽

Large Size ◽

High Relative Density ◽

Plasma Sintering ◽

Spark Plasma

Glassy Fe65Co10Ga5P12C4B4 alloy powders with a large supercooled liquid region of 50 K before crystallization were synthesized in the particle size range below 125 μm by Ar gas atomization. With the aim of developing a large-size Fe-based glassy core with good soft magnetic properties, the consolidation method of spark plasma sintering was applied to the Fe65Co10Ga5P12C4B4 glassy powders. The existence of the supercooled liquid region enabled us to form a large-size glassy alloy disc 20 mm in diameter and 5 mm in thickness with a high relative density of 99.7% at the glass-transition temperature of 723 K and under the external applied pressure of 300 MPa. The resulting glassy core of 18 mm in outer diameter, 10 mm in inner diameter, and 4 mm in thickness exhibits good soft magnetic properties: 1.20 T for saturation magnetization, 6 A/m for coercive force, and 8900 for maximum permeability. The good soft magnetic properties of the Fe-based bulk glassy core are attributed to the combination of the high relative density and the maintenance of the single glassy structure.

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Effect of sintering temperature on microstructure and magnetic properties for Fe-Si soft magnetic composites prepared by water oxidation combined with spark plasma sintering

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2019.165615 ◽

2019 ◽

Vol 491 ◽

pp. 165615 ◽

Cited By ~ 2

Author(s):

Zigui Luo ◽

Xi'an Fan ◽

Wentao Hu ◽

Fan Luo ◽

Guangqiang Li ◽

...

Keyword(s):

Magnetic Properties ◽

Spark Plasma Sintering ◽

Water Oxidation ◽

Sintering Temperature ◽

Soft Magnetic ◽

Magnetic Composites ◽

Plasma Sintering ◽

Soft Magnetic Composites ◽

Spark Plasma ◽

Microstructure And Magnetic Properties

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Structures and magnetic properties of Nd–Fe–B bulk nanocomposite magnets produced by the spark plasma sintering method

Journal of Materials Research ◽

10.1557/jmr.2004.0358 ◽

2004 ◽

Vol 19 (9) ◽

pp. 2730-2737 ◽

Cited By ~ 11

Author(s):

Tetsuji Saito ◽

Tomonari Takeuchi ◽

Hiroyuki Kageyama

Keyword(s):

Magnetic Properties ◽

Spark Plasma Sintering ◽

Applied Pressure ◽

High Coercivity ◽

Bulk Materials ◽

Soft Magnetic ◽

Nanocomposite Magnets ◽

Plasma Sintering ◽

Spark Plasma ◽

Sintering Method

We studied the effects of the sintering temperature and applied pressure on Nd–Fe–B bulk nanocomposite magnets produced by the spark plasma sintering (SPS) method. Amorphous Nd4Fe77.5B18.5 melt-spun ribbons were successfully consolidated into bulk form by the SPS method. When sintered at 873 K under applied pressures between 30 and 70 MPa, the bulk materials consisted of nanocomposite materials with a soft magnetic Fe3B phase and hard magnetic Nd2Fe14B phase. The density and magnetic properties of the bulk materials sintered at 873 K were strongly dependent on the applied pressure during sintering. Bulk Nd4Fe77.5B18.5 nanocomposite magnets sintered at 873 K under an applied pressure of 70 MPa showed a high remanence of 9.3 kG with a high coercivity of 2.5 kOe.

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Fe-Si/MnZn(Fe2O4)2 Core-shell Composites with Excellent Magnetic Properties by Mechanical Milling and Spark Plasma Sintering (SPS)

Metals ◽

10.3390/met8070553 ◽

2018 ◽

Vol 8 (7) ◽

pp. 553 ◽

Cited By ~ 6

Author(s):

Liang Yan ◽

Biao Yan

Keyword(s):

Magnetic Properties ◽

Spark Plasma Sintering ◽

Mechanical Milling ◽

Core Shell ◽

Magnetic Composite ◽

Soft Magnetic ◽

Magnetic Composites ◽

Plasma Sintering ◽

Soft Magnetic Composites ◽

Spark Plasma

The Fe-Si/MnZn(Fe2O4)2 composite powders are synthetized by means of the mechanical milling, and Fe-Si/MnZn(Fe2O4)2 soft magnetic composites are prepared by spark plasma sintering (SPS). The impact of milling time on particle size, phase structure and magnetic properties of the investigative core-shell structure powders along with that of sintering temperature on microstructure and magnetic properties of FeSi-MnZn(Fe2O4)2 soft magnetic composite are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The experimental results demonstrate a layer of MnZn(Fe2O4)2 forming a coating on the surface of Fe-Si powder after mechanical milling, and the soft magnetic composites exhibiting excellent magnetic performance at 900 °C: 212.49 emu/g for saturation magnetization, with 6.89 Oe for coercivity, 3 × 10−4 Ω.m for electrical resistivity and stable amplitude permeability and low core loss over a wide frequency range. Therefore, SPS offers a convenient and swift way to enhance performance of soft magnetic composites using magnetic materials as insulting layer.

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